TECHNICAL SPECIFICATIONS

5.1 Motor

5.1.1 Motor shall be 3-phase squirrel cage induction type unless otherwise specified in the data sheet.

5.1.2 The motor shall be rated for S2-15 minute duty and shall conform to IS:325, or equivalent international standard.

5.1.3 The motor shall be provided with thermostat(s)/thermistor(s) embedded in hot spot of motor windings.

5.1.4 The motor shall be able to operated the actuator at 75% of rated voltage.

5.1.5 Motor shall have class `F' insulation with temperature rise limited to class `B' limits. Winding shall be treated to resist corrosive agents and moisture.

5.1.6 Motor rotor shall preferably be of die cast aluminium and if braze shall be free from phosphorous.

5.2 Integral Starter and Control Transformer

The reversing starter, control transformer and local controls shall be integral with the valve actuator, unless as specified otherwise in the data sheet. Solid state control of valve actuator and upto-isolated interface fore remote control requirement maybe provided, wherever these features exist in manufacture's design.

The integral started shall be supplied with following devices:

(a) Electrically and mechanically interlocked reversing contractors for opening and closing operations.

(b) Control transformer with necessary tapping and protected with easily replaceable type HRC fuses.

(c) Terminal block for external cable connection fully premiered of internal devices of value actuator.

5.3 Integral Push Button, selector switches, indication and control devices

Following local control devices shall be provided, integral with MOV actuator: (a) Push buttons for "Opening/closing/stop" or alteratively `open/close' selector

switch.

(c) Indication lamps/LED's or mechanical indication for valve fully open fully closed.

(d) Local continuous position indications from fully open to fully closed status, which may be mechanical analogue or electronic digital type.

5.4 Torque & Travel Limit Switches

Torque limit switches shall be provided to protect the motor from over loading by cutting off the supply to motor during opening and closing operations. The switch shall be provided with potential free contacts of requisite number for valve actuator operation and of specified number for indication on remove panels, as per data sheet. It shall be possible to set the value of torque during closing from 50% to 100% of rated torque of actuators. Travel limit switch shall be provided to cut-off the supply to the motor at the end of present limit of valve travel and shall be provided with potential free contacts of requisite number for vale actuator operation and of specified number for indication on remote panels, as per data sheet. Instead of mechanical torque limit switches, magnetic pulse counter to measure and control the stroke of actuator may be provided, wherever this feature exists in manufacture's design

5.5 Control Facilities

The internal controls and monitoring circuits shall be incorporated within integral starter with transformer and control unit of valve actuator.

The remove control facility, if specified in the data sheet shall be provided. The remove control may be powered from internally derived control supply voltage unless specified in data sheet for using external supply for removal control. In order to cater to remove control and indication requirement for valve open, valve closed, remove/local/off position of selector switch, etc., as specified in the data sheet, the additional monitoring relay/auxiliary relay, if required shall form part of valve actuator supply.

One number hand-held infra-red remove programming device (where applicable) required for site commissioning and reconfiguring without the need of removal of the MoV cover, shall be supplied for each group of 5 valve actuator (or minimum on infra-red remove setting device, even if number of value actuators are less than five).

As an alternative common status contract for availability of the MOV actuator for remote control may be provided by monitoring the following:

- Loss of one or more phrase of power supply - Loss of control circuit supply

- Selector switch in local mode - Local stop such button set to off - Motor thermostat tripod

- Any other local fault/abnormal condition

5.6 Hand Operation

A hand with hand/auto lockable level shall be provided for emergency operation, of the MOV. The energisation of the motor shall automatically re-engage power operation.

5.7 Two Wire control system

Where specified on the data sheet the MOVs shall be suitable for 2 wire control system. These MOVs shall have individual field units connectable to a master station through a single 2 core cable loop for control and monitoring of MOVs. The maximum number of field units that can be connection to a master station and maximum number of control input and control/status output from each field unit that can be handled the 2 wire control system shall be indicted by the vendor.

Each field unit/MOV shall be addressable from the master station through a unique address code. Unless otherwise specified in the data sheet, all the field settable/adjustable parameters of the MoV shall be settable from the master station. Similarly all the indications available on the MOV shall be available at the master union. Full diagnostic feature for the MOV shall be available from the master station as well.

In case of a fault at any location in the cable loop the field units shall still have the accessibility to/from the master station through the other side of the cable loop. The master station shall be suitable for hook-up with the plant DSC system.

5.8 Position Indicator

The position indicator shall continuously indicate the position of travel of the valve. If specified in the data sheet a 4-20m. A remote position transmitter shall be provided in the valve actuator and one number continuous position indicator for mounting in Purchaser's remote panel shall be supplied as a loose item.

5.9 Name Plate

Each motorized valve actuator shall be provided with a stainless steel name plate attached firmly to it a place convenient for reading, furnishing the following details. A separate name plate shall be provided for hazardous area application.

i) Actuators tag number as per data sheet.

ii) Motor KW rating, motor time rating, motor supply voltage, phase nominal motor current, auxiliary switch rating.

iii) Max, Torque setting

iv) Actuator enclosure type, lubricant type

v) Actuator type, wiring diagram number/catalogue number, actuator serial number.

5.10 The enclosure of complete MOV actuator, including motor, integral starter and control transformer unit and all control devices shall have minimum IP-65 ingress protection.

5.11 Wiring and Terminals

All devices provided in the actuator shall be wired upto the terminal bloicim. The contacts for the remote operation and indication shall be wired upto the terminal block. 20% spare terminals shall be provided for future interlocks. Internal wiring for power and controls circuits shall be appropriately sized for MOV actuator rating. Each wire shall be identified at both ends using PVC ferrules. The terminal compartment shall be separated from the inner electrical components of the actuator by means of water tight seal so that the actuator electrical components are protected from the ingress of moisture and foreign materials when the terminal cover is removed during installation and maintenance.

5.12 Vendor shall be solely responsible for selection and sizing of various electrical devices.